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187869-29-0

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187869-29-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 187869-29-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,7,8,6 and 9 respectively; the second part has 2 digits, 2 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 187869-29:
(8*1)+(7*8)+(6*7)+(5*8)+(4*6)+(3*9)+(2*2)+(1*9)=210
210 % 10 = 0
So 187869-29-0 is a valid CAS Registry Number.

187869-29-0Relevant articles and documents

Synthesis of tetrahydro-1-benzazocin-2(1H)-ones using 8-endo-trig radical cyclization of 2,2-bis-(phenylthio)-at-[o-(prop-2-enyl)-phenyl]acetamides

Ikeda, Masazumi,Obata, Ken-Ichi,Oka, Jun-Ichiro,Ishibashi, Hiroyuki,Sato, Tatsunori

, p. 203 - 212 (2007/10/03)

The effects of N-substituents upon the 8-endo-trig radical cyclization of 2,2-bis(phenylthio)-N-[o-(prop-2-enyl)phenyl]acetamides (4) were examined. The N-(p-methoxybenzyl) (4a) and N-tosyl derivatives (4b), when treated with tributyltin hydride in the presence of a small amount of azoisobutyronitrile, gave regioselectively the corresponding 3,4,5,6-tetrahydro-3-phenylthio-1-benzazocin2(1H)-ones (5a,b) (8-endo cyclization products) in 40 and 47% yields, respectively, while the N-unsubstituted derivative (4c) afforded the reduction products (6c) and (8) as the major products. Some chemical transformation reactions of 5a are also described.

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